check_linux_mtu

                                        
Check the MTU of an interface on a Linux host.

                    

        
        

            
            

                

    

    
check_linux_mtu


Nagios and Icinga2 plugin to check the MTU of an interface on a Linux host and throw and alarm if the configured MTU deviates from the desired MTU.


Dependencies


This plugin requires:


    

  • Python3
    • 



How it works


The plugin reads the configured MTU from /sys/class/net//mtu. An alarm is raised if the configured MTU does not match the desired MTU.


Performance data


This plugin provides the following metrics:


    

  • mtu: configured MTU
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  • desired_mtu: desired MTU
    • 



Usage


See the examples below or execute the plugin with -h/--help.


Examples


Just provide the configured MTU:


./check_linux_mtu -d eth0
CONFIGURED MTU OK - Configured value is 1500. | mtu=1500


Check that the configured MTU matches the desired MTU:


./check_linux_mtu -d eth0 --desired-mtu 9000
CONFIGURED MTU CRTITCAL - Configured value is 1500, while the desired value is 9000 | mtu=1500 desired_mtu=9000